Surface passivation of undoped hematite nanorod arrays via aqueous solution growth for improved photoelectrochemical water splitting

Shaohua Shen, Mingtao Li, Liejin Guo, Jiangang Jiang, Samuel S. Mao

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

A facile solution-based strategy was found to be effective for surface passivation of undoped hematite nanorod photoanodes by adding noble-metal chlorides such as HAuCl4 and H2PtCl6 in the Fe3+ precursor solution. XPS and Raman spectra revealed that noble-metal ions would not be doped into, but lead to surface disorder of hematite. Incident photon to current efficiency (IPCE) of the hematite photoanode grown in HAuCl4 and H2PtCl6 contained precursor solution was increased from 3.6% to 11.5% and 12.9%, respectively, at 365nm and 1.23V vs. RHE (reversible hydrogen electrode). This photoelectrochemical (PEC) enhancement was ascribed to the surface passivation, which resulted in a reduced recombination of photogenerated carriers, as confirmed by ultrafast transient absorption spectroscopy.

Original languageBritish English
Pages (from-to)20-24
Number of pages5
JournalJournal of Colloid and Interface Science
Volume427
DOIs
StatePublished - 1 Aug 2014

Keywords

  • Hematite
  • Photoelectrochemical water splitting
  • Surface passivation

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